Protection method and device working after failure of vacuum circuit breaker

Abstract

A protection method and device working after failure of a vacuum circuit breaker are provided. According to the protection method, when a breaking signal is received, a detecting and processing device detects whether the vacuum circuit breaker has completed breaking operation or not, a closing signal is sent out to drive an operation mechanism to perform closing operation on the vacuum circuit breaker if the situation that the vacuum circuit breaker has completed the breaking operation is not detected, a fault alarm signal is sent to an upstream protection device at the same time, and the upstream protection device cuts off short-circuit current. The protection device comprises the detecting and processing device, the vacuum circuit breaker and the operation mechanism, wherein the detecting and processing device measures an electric signal of a vacuum arc-extinguishing chamber in the vacuum circuit breaker and controls the operation mechanism to act through a power amplifier, and the operation mechanism is connected with a conductive rod of the vacuum arc-extinguishing chamber through an insulation pull rod. By means of the protection method and device, breaking and closing actions of the vacuum circuit breaker are monitored in real time, and fault alarming is provided when the vacuum circuit breaker cannot break the short-circuit current effectively so that the upstream protection device can act in time to cut off the short-circuit current.

Description

technical field [0001] The invention relates to a protection method and device for a vacuum circuit breaker after failure, in particular to a method and device for protecting a vacuum circuit breaker after the vacuum circuit breaker fails to open. Background technique [0002] At present, the protection of the lines in the power distribution system is mainly provided by the vacuum circuit breakers connected in series in the lines. When the vacuum degree of the vacuum interrupter of the vacuum circuit breaker decreases, the density of the medium in the interrupter increases. When the opening command is received, the higher dielectric density increases the probability of electron collision in the arc extinguishing chamber, making the vacuum circuit breaker prone to reflashing, resulting in the inability to effectively break the short-circuit current. In addition, when the electrical ablation of vacuum circuit breaker contacts is serious, the high temperature generated by bre...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art. In order to overcome the deficiency that the existing vacuum circuit breaker cannot effectively break the short-circuit current due to the decrease of the vacuum degree or the ablation of the contacts, the present invention provides a vacuum circuit breaker failure The latest protection method and device, the device can not only monitor the opening and closing action of the vacuum circuit breaker in real time, but also provide a fault alarm when the vacuum circuit breaker cannot effectively break the short-circuit current, so that the upper-level protection equipment can act in time to cut off the short-circuit current, realizing The purpose of protecting electrical equipment

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